JP7489912B2 - Segment Joints - Google Patents

Description

This disclosure relates to segment connection joints.

JP 2005-320807 A (Patent Document 1) discloses a joint fitting used to join concrete segments that make up a tunnel. The joint fitting comprises a fitting body and an anchor bar. The fitting body is made of ductile cast iron. The fitting body includes a reinforcing bar connecting portion and a joint portion. A connecting hole is formed in the joint portion. The anchor bar is inserted into the connecting hole. The bent portion of the anchor bar is welded to the fitting body.

JP 2005-320807 A

The objective of this disclosure is to provide a segment connection joint in which the anchor bar is more firmly fixed to the joint body.

The segment connection joint of the present disclosure comprises a joint body, an anchor bar, and an adhesive member. The joint body includes a joint part and an anchor part connected to the joint part. The anchor part has a hole. The anchor part includes an inner circumferential surface that defines the hole. The inner circumferential surface includes a first surface facing the joint part and a second surface opposite the first surface. The anchor bar is inserted into the hole and is in contact with the first surface. The adhesive member is provided in the hole and bonds the anchor bar to the anchor part.

According to the segment connection joint disclosed herein, the anchor bar is firmly fixed to the joint body.

FIG. 2 is a schematic partially enlarged plan view showing an example of use of the segment connection joint of the first embodiment. 4 is a schematic partially enlarged cross-sectional view showing an example of use of the segment connection joint of the first embodiment. FIG. FIG. 2 is a schematic partially enlarged front view of the segment connection joint (female type segment connection joint) of the first embodiment. FIG. 2 is a schematic partial enlarged plan view of the segment connection joint (female segment connection joint) of the first embodiment. 4 is a schematic partially enlarged cross-sectional view of the segment connection joint (female segment connection joint) of the first embodiment taken along the cross-sectional line VV shown in FIG. 3. FIG. 2 is a schematic partially enlarged front view of the segment connection joint (male segment connection joint) of the first embodiment. FIG. 2 is a schematic partial enlarged plan view of a segment connection joint (male segment connection joint) of the first embodiment. FIG. 8 is a schematic partially enlarged side view of the segment connection joint (male segment connection joint) of the first embodiment, as viewed from the direction of arrow VIII shown in FIG. 7 . 9 is a schematic partially enlarged cross-sectional view of the segment connection joint (male segment connection joint) of the first embodiment taken along the cross-sectional line IX-IX shown in FIG. 6. 1 is a schematic plan view showing a step of a manufacturing method for a segment connection joint (female segment connection joint) of embodiment 1. FIG. 11 is a schematic plan view showing a step subsequent to the step shown in FIG. 10 in the manufacturing method of the segment connection joint (female type segment connection joint) of embodiment 1. FIG. FIG. 11 is a schematic partial enlarged plan view of a segment connection joint (female segment connection joint) of a first modified example of the first embodiment. FIG. 13 is a schematic partial enlarged front view of a segment connection joint (female type segment connection joint) of a second modified example of the first embodiment. FIG. 13 is a schematic partially enlarged front view of a segment connection joint (male type segment connection joint) of a modified example of the first embodiment. FIG. 11 is a schematic partially enlarged front view of a segment connection joint (female type segment connection joint) of embodiment 2. FIG. 11 is a schematic partial enlarged plan view of a segment connection joint (female segment connection joint) of embodiment 2. 17 is a schematic partial enlarged cross-sectional view of the segment connection joint (female segment connection joint) of the second embodiment taken along the cross-sectional line XVII-XVII shown in FIG. 16. FIG. 11 is a schematic partially enlarged front view of a segment connection joint (male segment connection joint) of embodiment 2. FIG. 11 is a schematic partial enlarged plan view of a segment connection joint (male segment connection joint) of embodiment 2. 20 is a schematic partial enlarged cross-sectional view of the segment connection joint (male segment connection joint) of embodiment 2 taken along the cross-sectional line XX-XX shown in FIG. 19 . FIG. 11 is a schematic partially enlarged front view of a segment connection joint (female type segment connection joint) of embodiment 3. FIG. 11 is a schematic partial enlarged plan view of a segment connection joint (female segment connection joint) of embodiment 3. FIG. 23 is a schematic partially enlarged side view of the segment connection joint (female segment connection joint) of embodiment 3, as viewed from the direction of arrow XXIII shown in FIG. 21 . FIG. 24 is a schematic partial enlarged cross-sectional view of the segment connection joint (female segment connection joint) of embodiment 3 taken along the cross-sectional line XXIV-XXIV shown in FIG. 21 . FIG. 22 is a schematic partial enlarged cross-sectional view of the segment connection joint (female segment connection joint) of embodiment 3 taken along the cross-sectional line XXV-XXV shown in FIG. 21 . FIG. 11 is a schematic partially enlarged front view of a segment connection joint (male type segment connection joint) of embodiment 3. FIG. 11 is a schematic partially enlarged plan view of a segment connection joint (male segment connection joint) of embodiment 3. FIG. 27 is a schematic partially enlarged side view of the segment connection joint (male segment connection joint) of embodiment 3, as viewed from the direction of arrow XXVIII shown in FIG. 26 . A schematic partially enlarged cross-sectional view of the segment connection joint (male segment connection joint) of embodiment 3 taken along the cross-sectional line XXIX-XXIX shown in FIG. 26. A schematic partial enlarged cross-sectional view of the segment connection joint (male segment connection joint) of embodiment 3 taken along the cross-sectional line XXX-XXX shown in FIG. 26. FIG. 13 is a schematic partially enlarged front view of a segment connection joint (female type segment connection joint) of embodiment 4. FIG. 32 is a schematic partially enlarged side view of the segment connection joint (female segment connection joint) of embodiment 4, as viewed from the direction of arrow XXXII shown in FIG. FIG. 13 is a schematic partially enlarged front view of a segment connection joint (male type segment connection joint) of embodiment 4. A schematic partially enlarged side view of a segment connection joint (male segment connection joint) of embodiment 4, as viewed from the direction of arrow XXXIV shown in Figure 33. FIG. 13 is a schematic partially enlarged front view of a segment connection joint (female type segment connection joint) of embodiment 5. FIG. 13 is a schematic partial enlarged plan view of a segment connection joint (female segment connection joint) of embodiment 5. FIG. 37 is a schematic partially enlarged side view of the segment connection joint (female segment connection joint) of embodiment 5, as viewed from the direction of arrow XXXVII shown in FIG. FIG. 37 is a schematic partial enlarged cross-sectional view of the segment connection joint (female segment connection joint) of embodiment 5 taken along the cross-sectional line XXXVIII-XXXVIII shown in FIG. A schematic partial enlarged cross-sectional view of the segment connection joint (female segment connection joint) of embodiment 5, taken along the cross-sectional line XXXIX-XXXIX shown in Figure 36. FIG. 13 is a schematic partially enlarged front view of a segment connection joint (male type segment connection joint) of embodiment 5. FIG. 13 is a schematic partial enlarged plan view of a segment connection joint (male type segment connection joint) of embodiment 5. FIG. 42 is a schematic partially enlarged side view of the segment connection joint (male segment connection joint) of embodiment 5, as viewed from the direction of arrow XLII shown in FIG. FIG. 44 is a schematic partial enlarged cross-sectional view of the segment connection joint (male segment connection joint) of embodiment 5 taken along the cross-sectional line XLIII-XLIII shown in FIG. FIG. 44 is a schematic partial enlarged cross-sectional view of the segment connection joint (male segment connection joint) of embodiment 5 taken along the cross-sectional line XLIV-XLIV shown in FIG. FIG. 13 is a schematic partial enlarged plan view of a segment connection joint (female segment connection joint) of embodiment 6. FIG. 46 is a schematic partially enlarged side view of a segment connection joint (female segment connection joint) of embodiment 6, as viewed from the direction of arrow XLVI shown in FIG. FIG. 13 is a schematic partially enlarged plan view of a segment connection joint (male segment connection joint) of embodiment 6. FIG. 48 is a schematic partially enlarged side view of a segment connection joint (male segment connection joint) of embodiment 6, as viewed from the direction of arrow XLVIII shown in FIG. 47.

The following describes an embodiment of the present disclosure. Note that the same reference numbers are used for the same configurations, and the description will not be repeated.

(Embodiment 1)
A segment connection joint according to a first embodiment will be described with reference to Figs.

Referring to Figures 1 and 2, when constructing a tunnel using the shield method, the walls of the tunnel are constructed by connecting multiple segments 1 and 5.

The segment 1 includes a segment body 2 and a female segment connection joint 3. The segment body 2 is formed, for example, mainly of reinforced concrete, and the segment 1 is, for example, an RC segment. The segment body 2 includes a connection surface 4. The female segment connection joint 3 is exposed from the connection surface 4 of the segment body 2. The segment 5 includes a segment body 6 and a male segment connection joint 7. The segment body 6 is formed, for example, mainly of reinforced concrete, and the segment 5 is, for example, an RC segment. The segment body 6 includes a connection surface 8. The male segment connection joint 7 is exposed from the connection surface 8 of the segment body 6. The segments 1 and 5 are connected to each other by the female segment connection joint 3 and the male segment connection joint 7, with the connection surface 4 of the segment body 2 and the connection surface 8 of the segment body 6 facing each other.

With reference to Figures 3 to 5, a female segment connection joint 3, which is an example of a segment connection joint of this embodiment, will be described. The female segment connection joint 3 includes a joint body 10, an anchor bar 37, and an adhesive member 35. The female segment connection joint 3 may further include a buffer sheet 39.

The joint body 10 is formed of cast iron, such as ductile cast iron. The joint body 10 includes a joint portion 11 and an anchor portion 20.

The joint portion 11 is provided with a receiving hole 12 that receives the insertion portion 42 (see Figures 6 and 7) of the male segment connection joint 7.

The joint part 11 is provided with a slit 13 that communicates with the receiving hole 12. The longitudinal direction of the slit 13 is the longitudinal direction of the receiving hole 12. When the insertion part 42 of the male segment connecting joint 7 is inserted into the receiving hole 12, the connecting part 43 (see Figures 6 and 7) of the male segment connecting joint 7 is inserted into the slit 13 and penetrates the slit 13. The width of the slit 13 is greater than the thickness of the connecting part 43 but smaller than the thickness of the insertion part 42 (see Figure 6). The width of the slit 13 is the length of the slit 13 in the short direction of the slit 13. The thickness of the insertion part 42 is the length of the insertion part 42 in the short direction of the insertion part 42. The thickness of the connecting part 43 is the length of the connecting part 43 in the short direction of the insertion part 42. The short direction of the insertion part 42 is the short direction of the slit 13.

The joint portion 11 includes a wall 14. The wall 14 closes one end of the receiving hole 12 and one end of the slit 13. The wall 14 prevents concrete contained in the segment body 2 from flowing into the receiving hole 12 when the segment 1 is manufactured. In addition, by forming the wall 14, the strength of the joint portion 11 can be increased.

The anchor portion 20 is connected to the joint portion 11. The joint portion 11 and the anchor portion 20 may be integrated or may be separate parts. As shown in Figures 1 and 2, the anchor portion 20 is embedded in the segment body 2.

The anchor portion 20 includes an outer surface 20a that is the most distal from the joint portion 11 (receiving hole 12), an outer surface 20b that is connected to the outer surface 20a, an outer surface 20c, an outer surface 20d, and an outer surface 20e. The outer surface 20c is connected to the outer surface 20a and faces the outer surface 20b. The outer surface 20d is connected to the outer surface 20a, the outer surface 20b, and the outer surface 20c. The outer surface 20e is connected to the outer surface 20a, the outer surface 20b, and the outer surface 20c, and faces the outer surface 20d. The outer surface 20a, the outer surface 20d, and the outer surface 20e each extend along the longitudinal direction of the receiving hole 12.

The anchor portion 20 has a hole 21. The hole 21 is a through hole that extends from the outer surface 20b to the outer surface 20c. The anchor portion 20 includes an inner circumferential surface 22 that defines the hole 21. The inner circumferential surface 22 includes a first surface 22a that faces the joint portion 11, and a second surface 22b that faces the first surface 22a. The first surface 22a is the surface of the inner circumferential surface 22 that is distal from the joint portion 11. The second surface 22b faces in the opposite direction to the joint portion 11. The second surface 22b is the surface of the inner circumferential surface 22 that is proximal to the joint portion 11.

The first surface 22a may extend along the anchor bar 37. For example, if a bent portion is formed in the middle of the anchor bar 37, the first surface 22a may be curved along the bent portion of the anchor bar 37.

The first surface 22a may include a plurality of protrusions 24. The plurality of protrusions 24 are arranged along the longitudinal direction of the anchor bar 37. At least two of the plurality of protrusions 24 may be provided at both ends of the first surface 22a in the longitudinal direction of the hole 21. At least two of the plurality of protrusions 24 provided at both ends of the first surface 22a function as anchors for the integrated anchor bar 37 and adhesive member 35. At least one of the plurality of protrusions 24 may be provided in the middle part of the first surface 22a excluding both ends of the first surface 22a (for example, the center part of the first surface 22a in the longitudinal direction of the hole 21). At least one of the plurality of protrusions 24 provided in the middle part of the first surface 22a may bite into the adhesive member 35 and may function as an anchor for the integrated anchor bar 37 and adhesive member 35.

The second surface 22b does not have to have a shape that follows the anchor bar 37. For example, if a bent portion is formed in the middle of the anchor bar 37, the second surface 22b may be a flat surface.

The second surface 22b may include a plurality of protrusions 25. At least two of the plurality of protrusions 25 may be provided at both ends of the second surface 22b in the longitudinal direction of the hole 21. At least two of the plurality of protrusions 25 provided at both ends of the second surface 22b function as anchors for the integrated anchor bar 37 and adhesive member 35. At least one of the plurality of protrusions 25 may be provided in an intermediate portion of the second surface 22b excluding both ends of the second surface 22b (e.g., the center portion of the second surface 22b in the longitudinal direction of the hole 21). At least one of the plurality of protrusions 25 provided in the intermediate portion of the second surface 22b may bite into the adhesive member 35 and may function as an anchor for the integrated anchor bar 37 and adhesive member 35. The plurality of protrusions 25 may be spaced apart from the anchor bar 37.

As an example, the anchor bar 37 is a deformed bar. As shown in Figs. 1 and 2, the anchor bar 37 is embedded in the segment body 2. Then, as described below, the anchor bar 37 is firmly fixed to the joint body 10 by using an adhesive member 35. Therefore, the joint body 10 is firmly fixed to the segment body 2. With reference to Figs. 3 to 5, a bent portion may be formed in the middle of the anchor bar 37 in the longitudinal direction. The anchor bar 37 may have a U-shape. The anchor bar 37 is inserted into the hole 21. Specifically, the bent portion of the anchor bar 37 is inserted into the hole 21.

The anchor bar 37 is in contact with the first surface 22a. Therefore, when the male segment connection joint 7 is connected to the female segment connection joint 3, even if a tensile stress toward the male segment connection joint 7 is applied to the female segment connection joint 3, the anchor bar 37 prevents the female segment connection joint 3 from moving relative to the segment body 2. For example, the anchor bar 37 may be in contact with the first surface 22a at both ends of the first surface 22a in the longitudinal direction of the hole 21. The anchor bar 37 may also be in contact with the first surface 22a at an intermediate portion of the first surface 22a excluding both ends of the first surface 22a (for example, the central portion of the first surface 22a in the longitudinal direction of the hole 21). The anchor bar 37 may be in contact with a plurality of protrusions 24.

The anchor bar 37 may be spaced apart from the second surface 22b. The anchor bar 37 may be spaced apart from the plurality of protrusions 25. Therefore, even if a bent portion is formed in the middle of the anchor bar 37, the bent portion of the anchor bar 37 can be easily inserted into the hole 21.

The joint body 10 is provided with a through hole 30. The through hole 30 communicates with the hole 21 and extends to the surface of the joint body 10. Specifically, the through hole 30 communicates with the hole 21 at the center of the hole 21 in the longitudinal direction of the hole 21. The through hole 30 extends to the inner circumferential surface that defines the receiving hole 12 and communicates with the receiving hole 12. The through hole 30 functions as an injection hole for the adhesive member 35 when the adhesive member 35 is supplied to the hole 21. Note that the position at which the through hole 30 is provided is not limited to this embodiment.

The adhesive member 35 is, for example, a resin adhesive whose main component is epoxy resin, or mortar. The adhesive member 35 is provided in the hole 21. The adhesive member 35 fills at least a portion of the hole 21. The adhesive member 35 may fill 50% or more of the volume of the hole 21. The adhesive member 35 may fill 80% or more of the volume of the hole 21, or may fill the entire hole 21. The adhesive member 35 bonds the anchor bar 37 to the anchor portion 20. The adhesive member 35 is bonded to the anchor bar 37 and is integrated with the anchor bar 37. The adhesive member 35 may be further provided in at least a portion of the through hole 30.

The buffer sheet 39 is, for example, a sheet having elasticity such as a foamed polyethylene sheet or a foamed rubber sheet. The buffer sheet 39 is provided on the joint body 10. The buffer sheet 39 is, for example, attached to the joint portion 11 and the anchor portion 20. Referring to FIG. 2, the buffer sheet 39 is disposed between the segment body 2 and the joint body 10. When the male segment connection joint 7 is connected to the female segment connection joint 3, a very large tensile stress toward the male segment connection joint 7 may be applied to the female segment connection joint 3. Even in such a case, the buffer sheet 39 allows the female segment connection joint 3 to move slightly relative to the segment body 2, preventing the segment body 2 from cracking.

With reference to Figures 6 to 9, a male segment connection joint 7, which is an example of a segment connection joint of this embodiment, will be described. The male segment connection joint 7 comprises a joint body 40, an anchor bar 62, and an adhesive member 60. The male segment connection joint 7 may further comprise a buffer sheet 64.

The joint body 40 is formed of cast iron, such as ductile cast iron. The joint body 40 includes a joint portion 41 and an anchor portion 45.

The joint portion 41 includes an insertion portion 42 and a connecting portion 43. When connecting the male segment connecting joint 7 to the female segment connecting joint 3, the insertion portion 42 is inserted into the receiving hole 12 provided in the female segment connecting joint 3. The connecting portion 43 connects the insertion portion 42 to the anchor portion 45. The connecting portion 43 is thinner than the insertion portion 42. When connecting the male segment connecting joint 7 to the female segment connecting joint 3, the connecting portion 43 is inserted into the slit 13 provided in the female segment connecting joint 3 and passes through the slit 13.

The anchor portion 45 is connected to the joint portion 41. The joint portion 41 and the anchor portion 45 may be integrated or may be separate parts. Specifically, the anchor portion 45 is connected to the connecting portion 43. As shown in Figures 1 and 2, the anchor portion 45 is embedded in the segment main body 6.

The anchor portion 45 includes an outer surface 45a that is the most distal from the joint portion 41 (insertion portion 42), an outer surface 45b that is connected to the outer surface 45a, an outer surface 45c, an outer surface 45d, and an outer surface 45e. The outer surface 45c is connected to the outer surface 45a and faces the outer surface 45b. The outer surface 45d is connected to the outer surface 45a, the outer surface 45b, and the outer surface 45c. The outer surface 45e is connected to the outer surface 45a, the outer surface 45b, and the outer surface 45c, and faces the outer surface 45d. The outer surface 45a, the outer surface 45d, and the outer surface 45e each extend along the longitudinal direction of the insertion portion 42.

The anchor portion 45 has a hole 46. The hole 46 is a through hole that extends from the outer surface 45b to the outer surface 45c. The anchor portion 45 includes an inner circumferential surface 47 that defines the hole 46. The inner circumferential surface 47 includes a first surface 47a that faces the joint portion 41 and a second surface 47b that faces the first surface 47a. The first surface 47a is the surface of the inner circumferential surface 47 that is distal from the joint portion 41. The second surface 47b faces in the opposite direction to the joint portion 41. The second surface 47b is the surface of the inner circumferential surface 47 that is proximal to the joint portion 41.

The first surface 47a may extend along the anchor bar 62. For example, if a bend is formed in the middle of the anchor bar 62, the first surface 47a may curve along the bend of the anchor bar 62.

The first surface 47a may include a plurality of protrusions 49. The plurality of protrusions 49 are arranged along the longitudinal direction of the anchoring bar 62. At least two of the plurality of protrusions 49 may be provided at both ends of the first surface 47a in the longitudinal direction of the hole 46. At least two of the plurality of protrusions 49 provided at both ends of the first surface 47a function as anchors for the integrated anchoring bar 62 and adhesive member 60. At least one of the plurality of protrusions 49 may be provided in the middle part of the first surface 47a excluding both ends of the first surface 47a (for example, the center part of the first surface 47a in the longitudinal direction of the hole 46). At least one of the plurality of protrusions 49 provided in the middle part of the first surface 47a may bite into the adhesive member 60 and may function as an anchor for the integrated anchoring bar 62 and adhesive member 60.

The second surface 47b does not have to have a shape that follows the anchor bar 62. For example, if a bent portion is formed in the middle of the anchor bar 62, the second surface 47b may be a flat surface.

The second surface 47b may include a plurality of protrusions 50. At least two of the plurality of protrusions 50 may be provided at both ends of the second surface 47b in the longitudinal direction of the hole 46. At least two of the plurality of protrusions 50 provided at both ends of the second surface 47b function as anchors for the integrated anchor bars 62 and adhesive member 60. At least one of the plurality of protrusions 50 may be provided in an intermediate portion of the second surface 47b excluding both ends of the second surface 47b (e.g., the center portion of the second surface 47b in the longitudinal direction of the hole 46). At least one of the plurality of protrusions 50 provided in the intermediate portion of the second surface 47b may bite into the adhesive member 60 and may function as an anchor for the integrated anchor bars 62 and adhesive member 60. The plurality of protrusions 50 may be spaced apart from the anchor bars 62.

The anchor bar 62 is, for example, a deformed bar. As shown in Figs. 1 and 2, the anchor bar 62 is embedded in the segment body 6. Then, as described below, the anchor bar 62 is firmly fixed to the joint body 40 by using an adhesive member 60. Therefore, the joint body 40 is firmly fixed to the segment body 6. With reference to Figs. 6 to 9, a bent portion may be formed in the middle of the anchor bar 62 in the longitudinal direction. The anchor bar 62 may have a U-shape. The anchor bar 62 is inserted into the hole 46. Specifically, the bent portion of the anchor bar 62 is inserted into the hole 46.

The anchor bar 62 is in contact with the first surface 47a. When the male segment connection joint 7 is connected to the female segment connection joint 3, even if a tensile stress toward the female segment connection joint 3 is applied to the male segment connection joint 7, the anchor bar 62 prevents the male segment connection joint 7 from moving relative to the segment body 6. For example, the anchor bar 62 may be in contact with the first surface 47a at both ends of the first surface 47a in the longitudinal direction of the hole 46. The anchor bar 62 may further be in contact with the first surface 47a at an intermediate portion of the first surface 47a excluding both ends of the first surface 47a (for example, the central portion of the first surface 47a in the longitudinal direction of the hole 46). The anchor bar 62 may be in contact with a plurality of protrusions 49.

The anchor bar 62 may be spaced apart from the second surface 47b. The anchor bar 62 may be spaced apart from the protrusions 50. Therefore, even if a bent portion is formed in the middle of the anchor bar 62, the bent portion of the anchor bar 62 can be easily inserted into the hole 46.

The joint body 40 is provided with a through hole 55. The through hole 55 communicates with the hole 46 and extends to the surface of the joint body 40. Specifically, the through hole 55 communicates with the hole 46 at the center of the hole 46 in the longitudinal direction of the hole 46. The through hole 55 extends to the outer surface 45a of the anchor portion 45. The through hole 55 functions as an injection hole for the adhesive member 60 when the adhesive member 60 is supplied to the hole 46. Note that the position at which the through hole 55 is provided is not limited to this embodiment.

The adhesive member 60 is, for example, a resin adhesive whose main component is epoxy resin, or mortar. The adhesive member 60 is provided in the hole 46. The adhesive member 60 fills at least a portion of the hole 46. The adhesive member 60 may fill 50% or more of the volume of the hole 46. The adhesive member 60 may fill 80% or more of the volume of the hole 46, or may fill the entire hole 46. The adhesive member 60 bonds the anchor bar 62 to the anchor portion 45. The adhesive member 60 is bonded to the anchor bar 62 and is integrated with the anchor bar 62. The adhesive member 60 may further be provided in at least a portion of the through hole 55.

The buffer sheet 64 is, for example, a sheet having elasticity such as a foamed polyethylene sheet or a foamed rubber sheet. The buffer sheet 64 is provided on the joint body 40. The buffer sheet 64 is, for example, attached on the connecting portion 43 and the anchor portion 45. With reference to FIG. 2 and FIG. 6, the end of the buffer sheet 64 proximal to the insertion portion 42 may be located on the connecting surface 8. With reference to FIG. 2, the buffer sheet 64 is disposed between the segment body 6 and the joint body 40. When the male segment connection joint 7 is connected to the female segment connection joint 3, a very large tensile stress toward the female segment connection joint 3 may be applied to the male segment connection joint 7. Even in such a case, the buffer sheet 64 allows the male segment connection joint 7 to move slightly relative to the segment body 6, preventing the segment body 6 from cracking.

With reference to Figures 3 to 5, 10 and 11, the manufacturing method of the segment connection joint of this embodiment will be explained using the female segment connection joint 3 as an example. The male segment connection joint 7 is also manufactured by the same manufacturing method.

Referring to FIG. 10, the manufacturing method of the segment connection joint (female type segment connection joint 3) of this embodiment includes casting the joint body 10. The joint body 10 is formed of cast iron such as ductile cast iron. The joint body 10 includes a joint portion 11 and an anchor portion 20. The anchor portion 20 is provided with a hole 21. The anchor portion 20 includes an inner peripheral surface 22 that defines the hole 21. The inner peripheral surface 22 includes a first surface 22a facing the joint portion 11 and a second surface 22b facing the first surface 22a. The first surface 22a may include a plurality of protrusions 24. The second surface 22b may include a plurality of protrusions 25.

The joint body 10 is provided with a through hole 30. The through hole 30 communicates with the hole 21 and extends to the surface of the joint body 10. Specifically, the through hole 30 extends to the inner peripheral surface that defines the receiving hole 12 and communicates with the receiving hole 12.

Referring to FIG. 10, the manufacturing method of the segment connection joint (female type segment connection joint 3) of this embodiment includes inserting an anchor bar 37 into a hole 21 provided in the anchor part 20. Specifically, a bent portion is formed in the middle part of the anchor bar 37. The bent portion of the anchor bar 37 is inserted into the hole 21 of the anchor part 20. The anchor bar 37 is in contact with the first surface 22a. The anchor bar 37 may be in contact with the multiple protrusions 24. The anchor bar 37 may be spaced from the second surface 22b. The anchor bar 37 may be spaced from the multiple protrusions 25.

With reference to FIG. 11, the manufacturing method of the segment connection joint (female type segment connection joint 3) of this embodiment includes supplying an adhesive member 35 to the hole 21. Specifically, the gap between the inner circumferential surface 22 of the hole 21 and the anchor bar 37 at both ends of the hole 21 in the longitudinal direction is blocked by a plug 65. The plug 65 is, for example, a rubber plug. The injection port of a dispenser (not shown) is arranged in the through hole 30. The adhesive member 35 is supplied to the hole 21 from the dispenser through the through hole 30. At least two of the multiple protrusions 24 provided at both ends of the first surface 22a and at least two of the multiple protrusions 25 provided at both ends of the second surface 22b function as a dam against the adhesive member 35 injected into the hole 21. The adhesive member 35 may be further supplied to at least a part of the through hole 30. Then, the adhesive member 35 is cured. In this way, the adhesive member 35 is provided in the hole 21. The multiple protrusions 24 and the multiple protrusions 25 function as anchors for the integrated anchor bars 37 and adhesive member 35. Then, the plug 65 is removed. However, it is not necessary to remove the plug 65.

The manufacturing method of the segment connection joint (female type segment connection joint 3) of this embodiment includes providing a buffer sheet 39 on the joint body 10 (joint portion 11). Specifically, the buffer sheet 39 is attached, for example, to the joint portion 11 and the anchor portion 20. In this way, the female type segment connection joint 3 (see Figures 3 to 5), which is an example of the segment connection joint of this embodiment, is obtained.

Referring to FIG. 12, in the female segment joint 3 of the first modified example of this embodiment, the through hole 30 may extend to the outer surface 20a of the anchor part 20.Referring to FIG. 13, in the female segment joint 3 of the second modified example of this embodiment, the through hole 30 may extend to the outer surface 20d or the outer surface 20e of the anchor part 20.Referring to FIG. 14, in the male segment joint 7 of the modified example of this embodiment, the through hole 30 may extend to the outer surface 45d or the outer surface 45e.

The effects of the segment connecting joint of this embodiment will be described.
The segment connection joint (female segment connection joint 3, male segment connection joint 7) of this embodiment includes a joint body (joint body 10, joint body 40), a first anchor bar (anchor bar 37, anchor bar 62), and a first adhesive member (adhesive member 35, adhesive member 60). The joint body includes a joint part (joint part 11, joint part 41) and an anchor part (anchor part 20, anchor part 45) connected to the joint part. The anchor part is provided with a first hole (hole 21, hole 46). The anchor part includes a first inner circumferential surface (inner circumferential surface 22, inner circumferential surface 47) that defines the first hole. The first inner circumferential surface includes a first surface (first surface 22a, first surface 47a) facing the joint part and a second surface (second surface 22b, second surface 47b) facing the first surface. The first anchor bar is inserted into the first hole and contacts the first surface. The first adhesive member is disposed in the first hole and adheres the first anchor bar to the anchor portion.

Therefore, the bonding area between the anchor part (anchor part 20, anchor part 45) and the first anchor bar (anchor bar 37, anchor bar 62) via the first adhesive member (adhesive member 35, adhesive member 60) increases. The first anchor bar is firmly fixed by the joint body (joint body 10, joint body 40). In addition, the joint body can be prevented from becoming brittle due to welding. The strength of the segment connection joint (female segment connection joint 3, male segment connection joint 7) can be prevented from decreasing. Furthermore, the first anchor bar is in contact with the first surface (first surface 22a, first surface 47a) of the first inner circumferential surface (inner circumferential surface 22, inner circumferential surface 47). Even if a tensile stress is applied to the segment connection joint, the segment connection joint can be prevented from moving relative to the segment body (segment body 2, segment body 6).

In the segment connection joints of this embodiment (female segment connection joint 3, male segment connection joint 7), the first surface (first surface 22a, first surface 47a) extends along the first anchor bar (anchor bar 37, anchor bar 62). This allows the volume of the first hole (hole 21, hole 46) to be reduced. This reduces the decrease in mechanical strength of the anchor part (anchor part 20, anchor part 45) in which the first hole is provided.

In the segment connection joints (female segment connection joint 3, male segment connection joint 7) of this embodiment, the first surface (first surface 22a, first surface 47a) includes a plurality of first protrusions (multiple protrusions 24, multiple protrusions 49) that are in contact with the first anchor bars (anchor bars 37, anchor bars 62). At least two of the multiple first protrusions are provided at both ends of the first surface in the longitudinal direction of the first holes (holes 21, 46).

Therefore, even if a tensile stress is applied to the segment connection joints (female segment connection joint 3, male segment connection joint 7), the segment connection joints can be prevented from moving relative to the segment main body (segment main body 2, segment main body 6). In addition, at least two of the multiple first protrusions (multiple protrusions 24, multiple protrusions 49) provided on both ends of the first surface (first surface 22a, first surface 47a) function as a dam for the first adhesive member (adhesive member 35, adhesive member 60) injected into the first hole (hole 21, hole 46). The multiple first protrusions prevent the first adhesive member from overflowing from the first hole, facilitating the supply of the first adhesive member into the first hole. In addition, the multiple first protrusions (multiple protrusions 24, multiple protrusions 49) function as anchors for the integrated first anchor bars (anchor bars 37, anchor bars 62) and the first adhesive members. The first anchor bar is firmly fixed by the joint body (joint body 10, joint body 40).

In the segment connection joints of this embodiment (female segment connection joint 3, male segment connection joint 7), the joint body (joint body 10, joint body 40) is provided with through holes (through holes 30, through holes 55). The through holes communicate with the first holes (holes 21, holes 46) and extend to the surface of the joint body.

Therefore, the first adhesive member (adhesive member 35, adhesive member 60) can be easily supplied to most or all of the first hole (hole 21, hole 46) through the through hole (through hole 30, through hole 55). The first anchor bar (anchor bar 37, anchor bar 62) is firmly fixed by the joint body (joint body 10, joint body 40).

The segment connection joints of this embodiment (female segment connection joint 3, male segment connection joint 7) further include a buffer sheet (buffer sheet 39, buffer sheet 64) provided on the joint body (joint body 10, joint body 40).

Even if a very large tensile stress is applied to the segment connection joints (female segment connection joint 3, male segment connection joint 7), the buffer sheets (buffer sheets 39, 64) allow the segment connection joints to move slightly relative to the segment bodies (segment bodies 2, 6), preventing the segment bodies from cracking.

(Embodiment 2)
A segment connection joint according to a second embodiment will be described with reference to FIGS.

Referring to Figures 15 to 17, the female segment connection joint 3b, which is an example of a segment connection joint of this embodiment, has a similar configuration to the female segment connection joint 3 of embodiment 1 and provides similar effects, but differs mainly in the following respects. In the female segment connection joint 3b, the first hole (hole 21) extends from the second outer surface (e.g., outer surface 20d) to the third outer surface (e.g., outer surface 20e).

Referring to Figures 18 to 20, male segment connection joint 7b, which is an example of a segment connection joint of this embodiment, has a similar configuration to male segment connection joint 7 of embodiment 1 and provides similar effects, but differs mainly in the following respects. In male segment connection joint 7b, the first hole (hole 46) extends from the second outer surface (e.g., outer surface 45d) to the third outer surface (e.g., outer surface 45e).

In the female segment joint 3b of the first modified embodiment of this embodiment, the through hole 30 may extend to the outer surface 20a of the anchor part 20. In the female segment joint 3b of the second modified embodiment of this embodiment, the through hole 30 may extend to the outer surface 20b or the outer surface 20c of the anchor part 20. In the male segment joint 7b of the modified embodiment of this embodiment, the through hole 55 may extend to the outer surface 20b or the outer surface 20c of the anchor part 20.

(Embodiment 3)
A segment connection joint according to a third embodiment will be described with reference to Figures 21 to 30 .

Referring to Figures 21 to 25, the female segment connection joint 3c, which is an example of a segment connection joint of this embodiment, has a similar configuration to the female segment connection joint 3 of the first modified example of embodiment 1 (see Figure 12), but differs mainly in the following respects.

The female segment connection joint 3c further includes an anchor bar 37b and an adhesive member 35b.

The anchor portion 20 is further provided with a hole 21b. The hole 21b is a through hole that extends from the outer surface 20b to the outer surface 20c. The anchor portion 20 includes an inner circumferential surface 23 that defines the hole 21b. The inner circumferential surface 23 includes a third surface 23a that faces the joint portion 11, and a fourth surface 23b that faces the third surface 23a. The third surface 23a is the surface of the inner circumferential surface 23 that is distal from the joint portion 11. The fourth surface 23b faces in the opposite direction to the joint portion 11. The fourth surface 23b is the surface of the inner circumferential surface 23 that is proximal to the joint portion 11.

The third surface 23a may extend along the anchor bar 37b. For example, if a bent portion is formed in the middle of the anchor bar 37b, the third surface 23a may curve along the bent portion of the anchor bar 37b.

The third surface 23a may include a plurality of protrusions 24b. The plurality of protrusions 24b are arranged along the longitudinal direction of the anchor bar 37b. At least two of the plurality of protrusions 24b may be provided at both ends of the third surface 23a in the longitudinal direction of the hole 21b. At least two of the plurality of protrusions 24b provided at both ends of the third surface 23a function as anchors for the integrated anchor bar 37b and adhesive member 35b, and function as a dam for the adhesive member 35b injected into the hole 21b. At least one of the plurality of protrusions 24b may be provided in the middle part of the third surface 23a excluding both ends of the third surface 23a (for example, the center part of the third surface 23a in the longitudinal direction of the hole 21b). At least one of the plurality of protrusions 24b provided in the middle part of the third surface 23a may bite into the adhesive member 35b and may function as an anchor for the integrated anchor bar 37b and adhesive member 35b.

The fourth surface 23b does not have to have a shape that follows the anchor bar 37b. For example, if a bent portion is formed in the middle of the anchor bar 37b, the fourth surface 23b may be a flat surface.

The fourth surface 23b may include a plurality of protrusions 25b. At least two of the plurality of protrusions 25b may be provided at both ends of the fourth surface 23b in the longitudinal direction of the hole 21b. At least two of the plurality of protrusions 25b provided at both ends of the fourth surface 23b function as anchors for the integrated anchor bar 37b and adhesive member 35b, and function as a dam for the adhesive member 35b injected into the hole 21b. At least one of the plurality of protrusions 25b may be provided in an intermediate portion of the fourth surface 23b excluding both ends of the fourth surface 23b (for example, the center portion of the fourth surface 23b in the longitudinal direction of the hole 21b). At least one of the plurality of protrusions 25b provided in the intermediate portion of the fourth surface 23b may bite into the adhesive member 35b and may function as an anchor for the integrated anchor bar 37b and adhesive member 35b. The plurality of protrusions 25b may be spaced apart from the anchor bar 37b.

As an example, the anchor bar 37b is a deformed bar. The anchor bar 37b is embedded in the segment body 2 (see Figures 1 and 2). Therefore, the joint body 10 is firmly fixed to the segment body 2. A bent portion may be formed in the middle of the anchor bar 37b in the longitudinal direction. The anchor bar 37b may have a U-shape. The anchor bar 37b is inserted into the hole 21b. Specifically, the bent portion of the anchor bar 37b is inserted into the hole 21b.

The anchor bar 37b is in contact with the third surface 23a. Therefore, when the male segment connection joint 7c is connected to the female segment connection joint 3c, even if a tensile stress toward the male segment connection joint 7c is applied to the female segment connection joint 3c, the anchor bar 37b prevents the female segment connection joint 3c from moving relative to the segment body 2. For example, the anchor bar 37b may be in contact with the third surface 23a at both ends of the third surface 23a in the longitudinal direction of the hole 21b. The anchor bar 37b may also be in contact with the third surface 23a at an intermediate portion of the third surface 23a excluding both ends of the third surface 23a (for example, the central portion of the third surface 23a in the longitudinal direction of the hole 21b). The anchor bar 37b may be in contact with a plurality of protrusions 24b.

The anchor bar 37b may be spaced apart from the fourth surface 23b. The anchor bar 37b may be spaced apart from the plurality of protrusions 25b. Therefore, even if a bent portion is formed in the middle of the anchor bar 37b, the bent portion of the anchor bar 37b can be easily inserted into the hole 21b.

The through hole 30 includes a through hole portion 31 and a through hole portion 32. The through hole portion 31 communicates with the hole 21 and extends to the surface of the joint body 10. Specifically, the through hole portion 31 extends to the outer surface 20a of the anchor portion 20. The through hole portion 32 communicates with the hole 21b and extends to the surface of the joint body 10. Specifically, the through hole portion 32 extends to the outer surface 20a of the anchor portion 20. The through hole portion 31 does not communicate with the through hole portion 32. The through hole portion 31 functions as an injection hole for the adhesive member 35 when the adhesive member 35 is supplied to the hole 21. The through hole portion 32 functions as an injection hole for the adhesive member 35b when the adhesive member 35b is supplied to the hole 21b.

The adhesive member 35b is, for example, a resin adhesive whose main component is epoxy resin, or mortar. The adhesive member 35b is provided in the hole 21b. The adhesive member 35b fills at least a part of the hole 21b. The adhesive member 35b may fill 50% or more of the volume of the hole 21b. The adhesive member 35b may fill 80% or more of the volume of the hole 21b, or may fill the entire hole 21b. The adhesive member 35b bonds the anchor bar 37b to the anchor portion 20. The adhesive member 35b is bonded to the anchor bar 37b and is integrated with the anchor bar 37b. The adhesive member 35b may be further provided in at least a part of the through hole 30 (through hole portion 32).

Referring to Figures 26 to 30, male segment connection joint 7c, which is an example of a segment connection joint of this embodiment, has a similar configuration to male segment connection joint 7 of embodiment 1, but differs mainly in the following respects.

The male segment connection joint 7c further includes an anchor bar 62b and an adhesive member 60b.

The anchor portion 45 further includes a hole 46b. The hole 46b is a through hole that extends from the outer surface 45b to the outer surface 45c. The anchor portion 45 includes an inner circumferential surface 48 that defines the hole 46b. The inner circumferential surface 48 includes a third surface 48a that faces the joint portion 41, and a fourth surface 48b that faces the third surface 48a. The third surface 48a is the surface of the inner circumferential surface 48 that is distal from the joint portion 41. The fourth surface 48b faces in the opposite direction to the joint portion 41. The fourth surface 48b is the surface of the inner circumferential surface 48 that is proximal to the joint portion 41.

The third surface 48a may extend along the anchor bar 62b. For example, if a bend is formed in the middle of the anchor bar 62b, the third surface 48a may curve along the bend of the anchor bar 62b.

The third surface 48a may include a plurality of protrusions 49b. The plurality of protrusions 49b are arranged along the longitudinal direction of the anchoring bar 62b. At least two of the plurality of protrusions 49b may be provided at both ends of the third surface 48a in the longitudinal direction of the hole 46b. At least two of the plurality of protrusions 49b provided at both ends of the third surface 48a function as anchors for the integrated anchoring bar 62b and the adhesive member 60b, and function as a dam for the adhesive member 60b injected into the hole 46b. At least one of the plurality of protrusions 49b may be provided in the middle part of the third surface 48a excluding both ends of the third surface 48a (for example, the center part of the third surface 48a in the longitudinal direction of the hole 46b). At least one of the plurality of protrusions 49b provided in the middle part of the third surface 48a may bite into the adhesive member 60b and may function as an anchor for the integrated anchoring bar 62b and the adhesive member 60b.

The fourth surface 48b does not have to have a shape that follows the anchor bar 62b. For example, if a bent portion is formed in the middle of the anchor bar 62b, the fourth surface 48b may be a flat surface.

The fourth surface 48b may include a plurality of protrusions 50b. At least two of the plurality of protrusions 50b may be provided at both ends of the fourth surface 48b in the longitudinal direction of the hole 46b. At least two of the plurality of protrusions 50b provided at both ends of the fourth surface 48b function as anchors for the integrated anchor bar 62b and adhesive member 60b, and function as a dam for the adhesive member 60b injected into the hole 46b. At least one of the plurality of protrusions 50b may be provided in an intermediate portion of the fourth surface 48b excluding both ends of the fourth surface 48b (e.g., the center portion of the fourth surface 48b in the longitudinal direction of the hole 46b). At least one of the plurality of protrusions 50b provided in the intermediate portion of the fourth surface 48b may bite into the adhesive member 60b and may function as an anchor for the integrated anchor bar 62b and adhesive member 60b. The plurality of protrusions 50b may be spaced apart from the anchor bar 62b.

The anchor bar 62b is, for example, a deformed bar. The anchor bar 62b is embedded in the segment body 6 (see Figures 1 and 2). Therefore, the joint body 40 is firmly fixed to the segment body 6. A bent portion may be formed in the middle of the anchor bar 62b in the longitudinal direction. The anchor bar 62b may have a U-shape. The anchor bar 62b is inserted into the hole 46b. Specifically, the bent portion of the anchor bar 62b is inserted into the hole 46b.

The anchor bar 62b is in contact with the third surface 48a. When the male segment joint 7c is connected to the female segment joint 3c, even if a tensile stress toward the female segment joint 3c is applied to the male segment joint 7c, the anchor bar 62b prevents the male segment joint 7c from moving relative to the segment body 6. For example, the anchor bar 62b may be in contact with the third surface 48a at both ends of the third surface 48a in the longitudinal direction of the hole 46b. The anchor bar 62b may further be in contact with the third surface 48a at the intermediate portion of the third surface 48a excluding both ends of the third surface 48a (for example, the central portion of the third surface 48a in the longitudinal direction of the hole 46b). The anchor bar 62b may be in contact with a plurality of protrusions 49b.

The anchor bar 62b may be spaced apart from the fourth surface 48b. The anchor bar 62b may be spaced apart from the plurality of protrusions 50. Therefore, even if a bent portion is formed in the middle of the anchor bar 62b, the bent portion of the anchor bar 62b can be easily inserted into the hole 46b.

The through hole 55 includes a through hole portion 56 and a through hole portion 57. The through hole portion 56 communicates with the hole 46 and extends to the surface of the joint body 10. Specifically, the through hole portion 56 extends to the outer surface 45a of the anchor portion 45. The through hole portion 57 communicates with the hole 46b and extends to the surface of the joint body 10. Specifically, the through hole portion 57 extends to the outer surface 45a of the anchor portion 45. The through hole portion 56 does not communicate with the through hole portion 57. The through hole portion 56 functions as an injection hole for the adhesive member 60 when the adhesive member 60 is supplied to the hole 46. The through hole portion 57 functions as an injection hole for the adhesive member 60b when the adhesive member 60b is supplied to the hole 46b.

The adhesive member 60b is, for example, a resin adhesive whose main component is epoxy resin, or mortar. The adhesive member 60b is provided in the hole 46b. The adhesive member 60b fills at least a portion of the hole 46b. The adhesive member 60b may fill 50% or more of the volume of the hole 46b. The adhesive member 60b may fill 80% or more of the volume of the hole 46b, or may fill the entire hole 46b. The adhesive member 60b bonds the anchor bar 62b to the anchor portion 45. The adhesive member 60b is bonded to the anchor bar 62b and is integrated with the anchor bar 62b. The adhesive member 60b may further be provided in at least a portion of the through hole 55 (through hole portion 57).

In the female segment joint 3c of the first modified example of this embodiment, the through hole portions 31 and 32 may extend to the inner circumferential surface that defines the receiving hole 12 and may be connected to the receiving hole 12. In the female segment joint 3c of the second modified example of this embodiment, the through hole portions 31 and 32 may extend to the outer surface 20d or the outer surface 20e of the anchor part 20. In the male segment joint 7c of the modified example of this embodiment, the through hole portions 56 and 57 may extend to the outer surface 20d or the outer surface 20e of the anchor part 20.

The segment connection joints of this embodiment (female segment connection joint 3c, male segment connection joint 7c) have the following effects in addition to the effects of the segment connection joints of embodiment 1 (female segment connection joint 3, male segment connection joint 7).

The segment connection joint (female segment connection joint 3c, male segment connection joint 7c) of this embodiment further includes a second anchor bar (anchor bar 37b, anchor bar 62b) and a second adhesive member (adhesive member 35b, adhesive member 60b). The anchor part (anchor part 20, anchor part 45) is provided with a second hole (hole 21b, hole 46b). The anchor part includes a second inner circumferential surface (inner circumferential surface 23, inner circumferential surface 48) that defines the second hole. The second inner circumferential surface includes a third surface (third surface 23a, third surface 48a) facing the joint part 41 and a fourth surface (fourth surface 23b, fourth surface 48b) facing the third surface. The second anchor bar is inserted into the second hole and is in contact with the third surface. The second adhesive member is provided in the second hole and adheres the second anchor bar to the anchor part.

Therefore, the bonding area between the anchor part (anchor part 20, anchor part 45) and the second anchor bar (anchor bar 37b, anchor bar 62b) via the second adhesive member increases. The second anchor bar is firmly fixed by the joint body (joint body 10, joint body 40). Furthermore, the second anchor bar is in contact with the third surface (third surface 23a, third surface 48a) of the second inner circumferential surface (inner circumferential surface 23, inner circumferential surface 48). Even if a tensile stress is applied to the segment connection joint (female segment connection joint 3c, male segment connection joint 7c), the segment connection joint can be prevented from moving relative to the segment body (segment body 2, segment body 6).

The joint body (joint body 10, joint body 40) is fixed to the segment body (segment body 2, segment body 6) by both the first anchor bar (anchor bar 37, anchor bar 62) and the second anchor bar (anchor bar 37b, anchor bar 62b). Therefore, the joint body can be fixed more firmly to the segment body. Alternatively, even if the diameter of each of the first anchor bar and the second anchor bar in this embodiment is smaller than the diameter of the first anchor bar in embodiment 1, the fixing strength of the joint body to the segment body in this embodiment can be made equal to or greater than the fixing strength of the joint body to the segment body in embodiment 1. Low-cost anchor bars can be used as the first anchor bar and the second anchor bar. The cost of the segment connection joint (female segment connection joint 3c, male segment connection joint 7c) can be reduced.

(Embodiment 4)
A segment connection joint according to a fourth embodiment will be described with reference to Figures 31 to 34.

Referring to Figures 31 and 32, the female segment connection joint 3d, which is an example of a segment connection joint of this embodiment, has a similar configuration to the female segment connection joint 3c of embodiment 3, but differs mainly in the following respects.

In the female segment connection joint 3d, the through hole portion 31 communicates with the hole 21 and the hole 21b. The through hole portion 32 communicates with the through hole portion 31 and extends to the surface of the joint body 10. Specifically, the through hole portion 32 extends to the outer surface 20a of the anchor portion 20. The adhesive member 35 is provided in the hole 21 as well as in the hole 21b. The through hole portions 31 and 32 function as injection holes for the adhesive member 35 when the adhesive member 35 is supplied to the holes 21 and 21b.

Referring to Figures 33 and 34, male segment connection joint 7d, which is an example of a segment connection joint of this embodiment, has a similar configuration to male segment connection joint 7c of embodiment 3, but differs mainly in the following respects.

In the male segment connection joint 7d, the through hole portion 56 communicates with the hole 46 and the hole 46b. The through hole portion 57 communicates with the through hole portion 56 and extends to the surface of the joint body 40. Specifically, the through hole portion 57 extends to the outer surface 45a of the anchor portion 45. The adhesive member 60 is provided in the hole 46 as well as in the hole 46b. The through hole portions 56 and 57 function as injection holes for the adhesive member 60 when the adhesive member 60 is supplied to the holes 46 and 46b.

In the female segment joint 3d of the first modified example of this embodiment, the through hole portion 32 may extend to the inner circumferential surface that defines the receiving hole 12 and may be connected to the receiving hole 12. In the female segment joint 3d of the second modified example of this embodiment, the through hole portion 32 may extend to the outer surface 20b or the outer surface 20c of the anchor part 20. In the male segment joint 7d of the modified example of this embodiment, the through hole portion 57 may extend to the outer surface 45b or the outer surface 45c of the anchor part 20.

The segment connection joints of this embodiment (female segment connection joint 3d, male segment connection joint 7d) have the following effects in addition to the effects of the segment connection joints of embodiment 3 (female segment connection joint 3c, male segment connection joint 7c).

In the segment connection joints (female segment connection joint 3d, male segment connection joint 7d) of this embodiment, the through holes (through holes 30, through holes 55) include a first through hole portion (through hole portion 31, through hole portion 56) that communicates with the first hole (hole 21, hole 46) and the second hole, and a second through hole portion (through hole portion 32, through hole portion 57) that communicates with the first through hole portion and extends to the surface of the joint body (joint body 10, joint body 40). A first adhesive member (adhesive member 35, adhesive member 60) is further provided in the second hole and adheres the second anchor bar to the anchor portion.

By injecting the first adhesive member (adhesive member 35, adhesive member 60) from the second through-hole portion (through-hole portion 32, through-hole portion 57), the first adhesive member can be supplied to the first hole (hole 21, hole 46) and the second hole (hole 21b, hole 46b). According to the segment connection joints (female segment connection joint 3d, male segment connection joint 7d) of this embodiment, the first adhesive member can be provided in the first hole and the second hole with fewer steps.

(Embodiment 5)
A segment connection joint according to the fifth embodiment will be described with reference to Figures 35 to 44.

Referring to Figures 35 to 39, the female segment connection joint 3e, which is an example of a segment connection joint of this embodiment, has a similar configuration to the female segment connection joint 3c of embodiment 3 and provides similar effects, but differs mainly in the following respects. In the female segment connection joint 3e, the first hole (hole 21) and the second hole (hole 21b) each extend from the second outer surface (e.g., outer surface 20d) to the third outer surface (e.g., outer surface 20e).

Referring to Figures 40 to 44, male segment connection joint 7e, which is an example of a segment connection joint of this embodiment, has a similar configuration to male segment connection joint 7c of embodiment 3 and provides similar effects, but differs mainly in the following respects. In male segment connection joint 7e, the first hole (hole 46) and the second hole (hole 46b) each extend from the second outer surface (e.g., outer surface 45d) to the third outer surface (e.g., outer surface 45e).

In the female segment joint 3e of the first modified example of this embodiment, each of the through-hole portions 31 and 32 may extend to the inner circumferential surface that defines the receiving hole 12 and may be connected to the receiving hole 12. In the female segment joint 3e of the second modified example of this embodiment, the through-hole portion 31 may extend to the outer surface 20b of the anchor portion 20, and the through-hole portion 32 may extend to the outer surface 20c of the anchor portion 20. In the male segment joint 7e of the modified example of this embodiment, the through-hole portion 57 may extend to the outer surface 45b of the anchor portion 20, and the through-hole portion 57 may extend to the outer surface 45c of the anchor portion 20.

(Embodiment 6)
45 to 48, a segment connection joint according to a sixth embodiment will be described.

Referring to Figures 45 and 46, the female segment connection joint 3f, which is an example of a segment connection joint of this embodiment, has a similar configuration to the female segment connection joint 3d of embodiment 4 and provides similar effects, but differs mainly in the following respects. In the female segment connection joint 3f, the first hole (hole 21) and the second hole (hole 21b) each extend from the second outer surface (e.g., outer surface 20d) to the third outer surface (e.g., outer surface 20e).

Referring to Figures 46 and 47, male segment connection joint 7f, which is an example of a segment connection joint of this embodiment, has a similar configuration to male segment connection joint 7d of embodiment 4 and provides similar effects, but differs mainly in the following respects. In male segment connection joint 7f, the first hole (hole 46) and the second hole (hole 46b) each extend from the second outer surface (e.g., outer surface 45d) to the third outer surface (e.g., outer surface 45e).

In the female segment joint 3f of the first modified example of this embodiment, the through hole portion 32 may extend to the inner circumferential surface that defines the receiving hole 12 and may be connected to the receiving hole 12. In the female segment joint 3f of the second modified example of this embodiment, the through hole portion 32 may extend to the outer surface 20d or the outer surface 20e of the anchor part 20. In the male segment joint 7f of the modified example of this embodiment, the through hole portion 57 may extend to the outer surface 45b of the anchor part 20, and the through hole portion 57 may extend to the outer surface 45d or the outer surface 45e of the anchor part 20.

The disclosed embodiments 1 to 6 and their modified examples should be considered as illustrative in all respects and not restrictive. For example, in the embodiments 1 to 6, the first hole (hole 21, hole 46) may be a female threaded hole, and the first anchor bar (anchor bar 37, anchor bar 62) may be a threaded bar (an example of a deformed bar). The pressure side flank of the female threaded hole is the first surface, the play side flank of the female threaded hole is the second surface, and the node of the threaded bar is in contact with the first surface. The first hole (hole 21, hole 46) may extend linearly from the outer surface (outer surface 20a, outer surface 45a) to the joint part (joint part 11, joint part 41). The first anchor bar (anchor bar 37, anchor bar 62) may have a linear shape. The second hole (hole 21b, hole 46b) may be a female threaded hole, and the second anchor bar (anchor bar 37b, anchor bar 62b) may be a threaded bar. The pressure side flank of the female thread hole is the third surface, the play side flank of the female thread hole is the fourth surface, and the node of the threaded joint rebar is in contact with the third surface. The second hole (hole 21b, hole 46b) may extend linearly from the outer surface (outer surface 20a, outer surface 45a) to the joint part (joint part 11, joint part 41). The second anchor bar (anchor bar 37b, anchor bar 62b) may have a linear shape. The scope of the present disclosure is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the claims.

1 Segment, 2 Segment body, 3, 3b, 3c, 3d, 3e, 3f Female segment connection joint, 4 Connection surface, 5 Segment, 6 Segment body, 7, 7b, 7c, 7d, 7e, 7f Male segment connection joint, 8 Connection surface, 10 Joint body, 11 Joint portion, 12 Receiving hole, 13 Slit, 14 Wall, 20 Anchor portion, 20a, 20b, 20c, 20d, 20e Outer surface, 21, 21b Hole, 22, 23 Inner surface, 22a, 23a First surface, 22b, 23b Second surface, 24, 24b, 25, 25b Protrusion, 30 Through hole, 31, 32 Through hole portion, 35, 35b Adhesive member, 37, 37b Anchor bar, 39 Buffer sheet, 40 Joint body, 41 Joint portion, 42 Insertion portion, 43 Connection portion, 45 Anchor portion, 45a, 45b, 45c, 45d, 45e Outer surface, 46, 46b Hole, 47, 48 Inner surface, 47a, 48a Third surface, 47b, 48b Fourth surface, 49, 49b, 50, 50b Protrusion, 55 Through hole, 56, 57 Through hole portion, 60, 60b Adhesive member, 62, 62b Anchor bar, 64 Buffer sheet, 65 Plug.

Claims (4)

A joint body including a joint portion and an anchor portion connected to the joint portion;
Anchor bars and
An adhesive member;
The anchor portion has a hole,
The anchor portion includes an inner circumferential surface that defines the hole, the inner circumferential surface including a first surface facing the joint portion and a second surface opposite to the first surface,
The first surface extends along the anchor bar,
The second surface does not have a shape that follows the anchor bar,
The anchor bar is inserted into the hole and contacts the first surface;
the adhesive member is a resin adhesive or mortar,
A segment connection joint, wherein the adhesive member is provided in the hole and bonds the anchor bar to the anchor portion. The first surface includes a plurality of protrusions in contact with the anchor bar,
The segment connection joint according to claim 1 , wherein at least two of the plurality of protrusions are provided on both ends of the first surface in the longitudinal direction of the hole. 3. The segment connection joint according to claim 1 or claim 2, wherein a through hole is provided in the joint body, the through hole being an injection hole for the adhesive member, communicating with the hole and extending to the surface of the joint body. The segment connection joint according to claim 1 , further comprising a buffer sheet provided on the joint body.

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